Ciiabence h



Patented Nov. 4, 1924.

liti (lli lit-lil.

Application tiled. Iliehruary klit, ltlftl. Serial lilo. tali-Zitti.

To ali whom may cof/weint:

Be it known Athat l"a @herinner ll. Doon- :i-raM, a Citizen ol the llnited tltatee, residing at Detroit, in the county olf lilayne and State ot lilieliigan, have invented certain new and useitnl lniprovei'nents in '.liool lleiainers, oi wliiiih the :tollowinp1 is speeilt e ation.

My invention relates to a retainer for retaining the working tool olf iinpaot tools such as the drill steel oli a timid pressure operated drill.. The object oi nrv invention is to produce a simple, ellieient and reliable retainer oiz this elnn'aeter possessin5gl advan tages over retainers heretoilore used. More over in'y retainer provided with ineans lor positively Vinaintainingl the retainer in its working position under all eonditions. Furthermore suoli. retainer is so inade 'to withstand the hlow olf through the working; tool or drill steel when such steel is withdrawn lroin a had hole. By holding the drill steel within. reach ol the piston a vibration is set up on the steel which will clear the saine :lfroin the hole under any condition. @ther novel and advantageous features of oonstruetion and operation will he apparent trom the description hereinafter given.

In the drawing Fig. l a plan view oit `the liront end of a drill to which .iny inven-l tion is shown applied; l? E?, a side eleva'- tion thereof with a poii'tion oil the retainerl in section; Fig. Ei an end view thereof; Fig. l an elevation oil. lthe loelr collar alone, i a side elevation olf the retainer proper; and Figa G a iront elevation olf inner ring or collar with the arins et the retainer in seetion on the line ti i5 ol lilip.

For the salte ot a elear and dellnite description oit' my invention l have shown the saine applied to a roel; drill and eooperating with the working; tool thereof which is a drill steel, hut it will he understood that my invention is not lin'iited to this speeiiie'use.

Referringl to the einhodinient ot inv in* vention as herein shown the roet; drill has the usual liront head 'l in which is inserted the working tool or drill steel 9; against which the hannnering piston (not shown) delivers its blow either directly or indirectly through the usual anvil piece. The retainer is mounted upon this liront head and has a ineinher which cooperates with the drill the hannner` steel and also with `the usual enlargement or collar Pl thereon in the manner hereinalter explained. rlcollar or rinp; l ie mounted to slide longitudin ally on the liront head 1|. against the tension oi a eoiled spring; eneireling suoli head and interposed he tween the ring` and a loeli; collar i3. The ring; is :noi-inail;T held to its norinal rear-- ward position against Vthe shoulder on the head by 'this spring hut adapted to yieldnieve iiorward against the tension thereof. lhe ring has suoli a longitudinal inoveineni': hut is prevented iroin rotatine)` thereon h v reason oi the provision oit Conic }V leinentar v tlats of sueh head l and in the ring` 9. ihe loeli collar. shown hy itsel l' in ling. --i, is provided with a series olf' grooves Fi and recesses 9 which are adapted to cooperate with lugs l0 on the iiforwarifl end ol the liront head l of the drill in such a inanner that after the Collar has heen inserted on such iront end and heen turned angularly the proper distance the recesses 9 will engage with the lugs wherein; the collar will he removably loelred in position on such end oit the head.

The retainer proper Consists oli a traine havnlt; opposite parallel. side ineinhers ll. ll pivoted at their rearward or :tree ends upon the pins l?, on opposite sides oi Athe ring 1l: and a connecting,l `cross piece on jvoire portion 1B which staddles the drill steel El as shown in ltlig'. il, the saine heinp; arranged in the path el movement ol the collar i of such drill.

il. holding ring; jill eneireles the and adapted to he slid on the which act in oliset grooves or reeee .li in the eollar, shown in llig. 3. llhe tainer proper is nornnill;7 .in the worliingii position shown in the diaivinii` hut the saine is adapted to he swung` upwardly. Uhviousli7 when the collar ill is in its forward position as shown in the drawing` the re tainer is held in its working` position in Cooperation with the drill steel hut when suoli collar slid rearwardli7 to or haelt: of the pivotal. point ot the retainer., suoli retainer niai7 he ireely swung upwardly out el range oli the drill steel. The collar 'l-l is held in its normal 'forward position hy suitable means such as the spring linger 1G secured to the loeli eollar G hy the sere'w ll and passing` through a hole lli in the. eollar il and also havingl a curved treo end lil.

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y moving the free ond 'lil inwardly the collar M may be withdrawn from the finger and be retracted rearwardly.

As shown in Fig. i the lock collar 6 is preferably provided with opposite lugs 20 upon which the arms ll rest when in their normal or Working position.

It Will be understood that the retainer is of such solidity or strength that the collar 3 of the drill steel may be permitted to strike against the retainer and set up sui!- ficient vibration in the steel to loosen it from any bad hole wherein it would otherwise remain stuck. Moreover che retainer is rso mounted that it may readily yield With respect to the iront head of thc drill by reason of the provision ol the spring l prefer to malge the retainer proper out ot a piece ot `iiat stoel; in the manner shovvn, thereby providing great strength vwith com paratively little Weight. Moreo'ffer the sliding ring or Acollar let Which sr unds the arms el. the retainer proper is adapted to act as a support preventing the retainer from spreading or becoming distorted in any Way due to strain put upon it. This colla-r also affords quick and simple means tor holding the retainer in position.

I claim l. In combination with the front head of a machine and its projecting Working tool, a tool retainer comprising acollar on the head, a1 retainer proper having side arms pivoted on yt-he collar and having a. central portion adapted to cooperate with tiie Working tool, and means for holding the retainer in such cooperating position, consisting of a collar surrounding and movable longitudinally of said arms.

2. In combination with the front head of a machine and its projecting Working tool, a tool retainer comprising a. collar on the head, a retainer proper having 'side arms pivoted on the collar and having a central portion adapted to cooperate with the Working tool, and means for holding the retainer in such cooperating position, consist ing of 'a collar Asurrounding and movable longitudinally of said arms, and a clutch device for holding the latter collar in its foi-Ward or Working position.

V3. In combination with the front head of a machine and its projecting Working tool, a t'ool retainer comp-rising acollar on the lread, a retainer proper having side arms pivoted on the. vcollar and having a central port-'ion vadapted to cooperate with the Working tool, and means for holding the retainer in such cooperating position, consisting of a. collar =surroi'indi'n'g and movable longitudr nally loli' 'said arms, a third collar on the efe treme front end of the head, and ak catch device mounted on such third collar v'for holding the second mentioned collar in its for vard or working position.

4.111 coi'nbination with the front head of a machine and its pixijccling working tool, a tool retainer comprising a collar on the head, a retainer proper having side arms pivoted on the collar and having a central portion adapted to cooperate with the working tool, and means for holding the retainer in such cooperating position, consisting olf a collar surrounding said arms and having interna-l side recesses which receive such arms and by which such collar slides thereon.

5. In combination with the front head of a machine and its projecting working tool, a. tool retainer comprising ay collar mounted to yieldingly slide longitudinalh on such head, the front head having spaced lugs at its extreme 'forward end, a collar having complementary grooves and recesses to cooperate with said lugs whereby that collar is removably locked to thel head, a spring between the two collars, and a member pivoted to the first mentioned collar and arranged to engage a tool.

6. The combination with the front head of a machine and its projecting tool, of a tool retainer comprising a pair of collars and an intermediate spring all slemf'able over said head, one collar and the head having cooperating surfaces to prevent relative rotation between the same and to provide an abutment on the head against which the said collar abuts, and a tool-engaging mem` ber mounted on the said collar.

7. The combina-tion with the front hemd of a machine and its projecting tool, of a tool retainer com rising a pair of collars and an intermediate spring, all sleevable, over said head, an abutment on said head arranged to be engaged by one of said col lars, a. tool 'engaging member pivotod on said collar, and means operable upon the partial rotation of the other collar on said head for locking said last named colla-r on said head.

8. The combination with the front head of machine -al-nd its projecting working tool, of a t'o'ol retainer comprising a pair oac collars and an intermediate spring, all sleevable over said head, :in abutment on said head arranged to be engaged by one ol said collars, a -tool engaging member pivoted on last named collar, and a lug on said head, the other of said collars being slotted to pass over said lug and having a. recess in its outer face angularly removed from said slot for locking engagement with said lug.

9. The combination with the front head of a machine and its projecting working tool, of a tool retainer comprising n n assembly slecvable over said head from the end thereof and including a. pair of collars, an intermediate spring and a tool engaging .member pivotally attached to one of said collars, the other collar being provided with a slot and :mienne a recess in .its outer face. angulariy removed liroln Said slot, and a lug on said head adapted to pass through said slot and to engage said recess upon a partial rotation of said last named collar to look the same to the head.

10. In combination with the front head of a machine and its projecting Working tool, a tool retainer comprising a collar lno unted to slide .longitudinally en Snell head, said collar and head having,` oooperatn :ing portions to prevent rotation oi the eoiiar, a spring cooperating` with Said Collar, and a retainer proper pivoted on said collar and having eide arms and a central oroesportion, and stops adapted to be engaged by the side arms of the retainer.

CLARENCE H. DOCKHAM., 

